flock after (someone or something)
To pursue or follow someone or something in large numbers. A: "Whoa, I almost got mowed down by a ton of teens!" B: "They must have been flocking after the hunky actor that just left the restaurant."
flock after someone or something
to follow someone or something in a group. The children flocked after the man playing the flute. Fans flocked after the movie star as he went from his limo into the hotel.